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Peru
Corihuarmi Mine

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 Location:
69 km SW from Huancayo, Peru

  Regional Office:
Av. Santa Cruz Nº 830, Of. 401 Miraflores
Lima
Peru
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life2024


Owners

Source: p. 4
CompanyInterestOwnership
Minera IRL Ltd. 100 % Indirect
Minera IRL S.A. (operator) 100 % Direct
Minera IRL Ltd. operates the Corihuarmi Gold Mine through its subsidiary Minera IRL SA.

Contractors

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Deposit Type

  • Epithermal
  • Hydrothermal


Summary:

The Property is located at the northern extent of the southern Peru Au-Ag epithermal belt. Mineralisation identified at the Property is of a high-sulphidation (HS) epithermal type hosted in volcanic rocks close to the Chonta fault, a regionally significant NNW trending structure. The Chonta fault is a major geological break which separates Cenozoic volcanic deposits from folded Paleozoic sediments. Zoned alteration and mineralisation are centred on dacitic and rhyodacitic domes intruded close to the Chonta Fault at its intersection with subordinate NE faults.

Outcrop is obscured by vegetation and quaternary deposits.

The north-northwest trending Chonta fault, obscured in part by quaternary deposits, separates folded Cretaceous and Jurassic sediments from Cenozoic volcanics and is the main conduit for extensive hydrothermal alteration.

Hydrothermal alteration related to inferred buried intrusions is recorded to the southwest of the Chonta fault in Cenozoic volcanics. Centres of alteration, observable on remote sensingimagery, are mapped along the Chonta fault. Alteration is particularly strong where secondary northeast faults intersect the Chonta fault.

Variably sub-cropping and outcropping dacite and rhyodacite domes and more recent volcanic deposits dominate geology and the Property. Domes broadly define the margins of a collapsed caldera structure measuring 4.5 by 3.5 km, elongate along a north-northwest trend (Coffey, 2010).


Mining Methods

  • Truck & Shovel / Loader


Summary:

Gold mineralization at Corihuarmi is mined by open pit methods. In 2020, the average grade produced was 0.25 grams per tonne (“g/t”) gold, with 22,593 ounces of gold recovered through a leaching process.

Mining at Corihuarmi uses a conventional truck and excavator configuration. Open pits are mined on 5 meterhigh benches through drilling, blasting, loading and hauling unit operations. The material transportation circuit is performed in two parts. First is from the pit to the crusher, and the second one from the crusher to the leach pad. If the mineralized material does not warrant crushing, the material is transported directly to the leach pad as run-of-mine. The waste is transported to the waste dump.


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits2022202120202019201820172016
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required22,68424,70923,399
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required4,233,665 t3,948,634 t3,109,206 t3,040,331 t
Waste  ......  Subscription required  ......  Subscription required2,686,333 t2,030,322 t2,213,433 t1,430,311 t
Daily ore mining rate  ......  Subscription required  ......  Subscription required9,000 t9,000 t8,500 t8,300 t
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Reserves at February 28, 2021:
The Mineral Resource is reported inside a pit designed with a cut-off grade of 0.1 g/t gold.

CategoryTonnage CommodityGradeContained Metal
Measured 8 Mt Gold 0.2 g/t 51.1 kt
Indicated 5.83 Mt Gold 0.22 g/t 41.2 kt
Measured & Indicated 13.83 Mt Gold 0.21 g/t 92.3 kt
Inferred 0.2 Mt Gold 0.2 g/t 1.5 kt

Commodity Production Costs:

CommodityUnits202120202019201820172016
Cash costs Gold USD
Total cash costs Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 909 / oz   849 / oz   806 / oz  
Total cash costs (sold) Gold USD
All-in sustaining costs (AISC) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,111 / oz   1,106 / oz   1,074 / oz  
Subscription required - Subscription is required.

Financials:

Units2022202120202019201820172016
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 1.8   5.6   3.7  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 28.9   30.7   29.2  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 5.1   7.6   7.2  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -6   0.8   -10.4  
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Heavy Mobile Equipment:
HME TypeModelSizeQuantityRef. Date
Compactor ....................... Subscription required ....................... Subscription required May 2, 2018
Dozer (crawler) ....................... Subscription required ....................... Subscription required May 2, 2018
Dozer (crawler) ....................... Subscription required ....................... Subscription required May 2, 2018
Dozer (crawler) ....................... Subscription required ....................... Subscription required May 2, 2018
Drill ....................... Subscription required 4 inch ....................... Subscription required May 2, 2018
Excavator ....................... Subscription required 2.4 cu. m ....................... Subscription required May 2, 2018
Excavator ....................... Subscription required ....................... Subscription required May 2, 2018
Grader ....................... Subscription required ....................... Subscription required May 2, 2018
Loader (FEL) ....................... Subscription required 4.5 cu. m ....................... Subscription required May 2, 2018
Truck (dump) ....................... Subscription required 40 t ....................... Subscription required Aug 16, 2019
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 4, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 4, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 4, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 4, 2022
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Staff:

EmployeesYear
Subscription required 2021

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Pre-Feasibility Study Report 2018
Annual Information Form 2017
Annual Report 2017
Management Discussion & Analysis 2017
Technical Report 2017
Annual Information Form 2016
Annual Report 2016
Corporate Presentation 2016
Management Discussion & Analysis 2016
Annual Information Form 2015
Annual Report 2015
Management Discussion & Analysis 2015
Technical Report 2010
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